Programmer Group

###rem adaptation Advantages: meta tags can be used to achieve proportional scaling Disadvantages: conversion is difficult Core idea: Based on REM, the element unit in layout is rem, and the font size of html root element is set to screen width rem adaptation: large design drawings and relatively many elements (750px,1080px) ...

Recently, there is a demand that the Android device is connected with a code scanning gun, and the system reads the scanning content of the code scanning gun. I checked some examples on the Internet, but it was not easy to use them. Finally, I realized one by myself (only English letters and symbols are supported at present). ...

[DESCRIPTION] After power on and unlocking, if there are multiple launchers in the system, a selection box will pop up to let the user choose to enter a launchers. If the user does not want to select, but wants to directly enter a default Launcher, how to modify it? [SOLUTION] Note: this modification method is not valid for ...

Android can print multiple APP packages in the same set of code and install and run on the same mobile phone Android can print multiple APP packages in the same set of code and = = install and run on the same phone = =, and = = APP name and desktop icon are also different== Give different package names to the same set of code ...

I'm trying to create a messaging application in Android. If I use: Intent emailIntent = new Intent(android.content.Intent.ACTION_SEND); This will launch the built-in Android App; I tried to send mail without using this app by clicking the button directly. #1 building This is an alternative version, which is also useful for me, wi ...

When developing, we will inevitably encounter the situation of loading pictures. When the size of pictures is smaller than the size of ImageView, we can certainly happy to load the display directly. But if we load a picture that is much larger than the size of the ImageView, displaying it directly with the ImageView will have a bad visual effe ...

Fragment, or fragment for short, is proposed by Android 3.0 (API 11). In order to be compatible with the lower version, a set of Fragment API has been developed in support-v4 library, which is at least compatible with Android 1.6. In the past, the support-v4 library was a jar package. Since version 24.2.0, the support-v4 libra ...

I want to draw a line in the middle of the layout and use it as a separator for other items such as TextView. Is there a good widget. I really don't want to use images because it's hard to match other components to it. I hope it can also be relatively positioned. Thank you #1 building I usually use this code to add horizontal lines: &l ...

1 problem Android sends messages to js natively and can carry data       2 implementation principle Android native can use RCTEventEmitter to register events, then you need to specify the name of the event here, and then listen to the name of the same event on the js side, and you can receive the message and get the data ...

This blog focuses on Android Bluetooth BLE basic communication. 1, Add permission <uses-permission android:name="android.permission.BLUETOOTH"/> <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/> However, after Android 6.0, you need to dynamically apply for location permission. <uses-permi ...